be quiet! Pure Power 12 M 850W PSU Review

The be quiet! Pure Power 12 M is a quiet PSU, honoring the brand’s name, with ATX v3.0 and PCIe 5.0 compatibility. It comes with a 600W 12VHPWR connector, although ATX spec recommends a 300W for this capacity, and it is supported by a ten-year warranty. 

The be quiet! Pure Power 12 M 850W is included in my best ATX v3.0 & PCIe 5.0 PSU picks article.

be quiet! is known for its silent products, and the Pure Power 12 M is no exception, although it is not the quietest unit in the 850W category. It is equipped with a 600W 12VHPWR connector, although this is overkill for an 850W unit, and has a pair of 12V rails. The fully modular cable design is a must in this price category. Efficient-wise, this unit gets a Cybenetics Platinum rating, meaning that its platform is efficient and more efficient than the 80 PLUS Gold badge depicts. I should note that 80 PLUS checks efficiency at only 3-4 different load levels. At the same time, Cybenetics does that from the results of more than 1450 different load combinations, so you can easily figure out which standard provides higher accuracy.



The PSU is compact enough, with 160mm depth. It has normal dimensions for today’s standards. The cooling fan measures 120mm in diameter and has no semi-passive operation, which is not a big deal when the fan spins at low speeds under light loads. It is preferable to have the fan spinning constantly, not allowing heat build up at the PSU’s internals.


Technical Specifications:
  • Manufacturer (OEM): HEC
  • Max Power: 850W
  • Cybenetics Efficiency: [115V] Cybenetics Platinum (89-91%)
  • 80 Plus Efficiency: Gold
  • Noise: Cybenetics A- (25-30 dB[A])
  • Compliance: ATX v3.0, EPS 2.92
  • Operating Temperature (Continuous Full Load): 0 – 40°C
  • Alternative Low Power Mode support: Yes
  • Power 12V combined: 850W
  • Number of 12V rails: 1
  • Power 5V + 3.3v: 120W
  • Power 5VSB: 15W
  • Cooling: 135mm Fluid Dynamic Bearing Fan (HA13525H12F-Z)
  • Semi-Passive Operation: No
  • Modular Design: Yes (Fully)
  • High Power Connectors: 2x EPS (2x cables), 4x PCIe 6+2 pin (2x cables), 1x PCIe 12+4 pin (600W)
  • Peripheral Connectors: 6x SATA (5x cables), 2x 4-pin Molex (single cable)
  • ATX Cable Length: 550mm
  • EPS Cable Length: 600mm
  • 12VHPWR Cable Length: 600mm
  • Distance between SATA & 4-pin Molex: 150
  • In-cable capacitors: No
  • Dimensions (W x H x D): 150 mm x 85 mm x 160mm
  • Weight: 1.85 kg (4.08 lb)
  • Warranty: ten years
  • Street price (excluding VAT): $135

Power Specifications

Rail 3.3V 5V 12V1 12V2 5VSB -12V
Max. Power Amps 22 22 40 36 3 0.3
Watts 120 850 15 3.6
Total Max. Power (W) 850
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12 thoughts on “be quiet! Pure Power 12 M 850W PSU Review

  1. After having coil whine on Vertex Gx 1200 which i paid 350 EUROS i bought the Be quiet 12M 1000w 205 Euros for my rtx 4090 and there is no more coil whine or buzzing in sleep or idle.

    Im happy with it for now.

  2. I wish you could review the MSI MPG A850G PCIE5 psu which is the closest competitor in terms of price and specs.

  3. Hi aris, are these non japanese caps enough to discard the psu considering the overall performance? It’s the cheapest atx 3.0 psu in europe, rmx shift and toughpower gf3 are 50€ more expensive.

    1. If the price difference is that large, go for the be quiet! unit. These guys seem to trust it a lot, to give it such a long warranty, after all.

    2. Does this review apply to the 1000 watt version too? I’m not very knowledgeable so I don’t know if quality varies a lot between versions.

  4. Just a note on this PSU – the 24pin ATX Power Cable is only 550mm long so can be a very tight fit in a mid sized case like the Phanteks P600S.

    1. I should add that I also value customer service and RMA simplicity in Europe, tbh I only heard bad things about TT support and good things about be quiet, which could flip the balance even if TT GF3 is the better unit.

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